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Overview of the Army Corps and EPA Rule to Define “Waters of the United States” (WOTUS) and Recent Developments

Published Oct 22, 2018Updated Jun 20, 2025

The Congressional Research Service is a nonpartisan policy and legal analysis arm of the Library of Congress. CRS reports are written for members of Congress and their staff, not the public — but they’re made available openly through Congress.gov.

Overview of the Army Corps and EPA Rule to Define “Waters of the United States” (WOTUS) an… — Informed